The Effects of Eight Weeks of Isometric Training on Torque and EMG of the Knee Extensor Muscles PDF Download
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Author: William D. Bandy
Publisher:
ISBN:
Category : Isometric exercise
Languages : en
Pages : 470
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Book Description
Author: William D. Bandy
Publisher:
ISBN:
Category : Isometric exercise
Languages : en
Pages : 470
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Book Description
Author:
Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 858
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Author: Jennifer L. Donner
Publisher:
ISBN:
Category : Isokinetic exercise
Languages : en
Pages : 68
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Abstract: The purpose of this study was to determine the effects of limited range of motion (ROM) isokinetic knee extensor exercise on isometric strength development inside and outside the trained ROM. Four male and 18 female volunteers between the ages of 20 and 48 years were randomly assigned to one of two groups. The experimental group trained the knee extensors isokinetically on the KINCOM from 45 to 0 degrees of knee flexion three times a week for five weeks. The control group did not train. Both groups were pretested and posttested on the KINCOM for isometric knee extensor peak torque at 15, 25, 35, 55, 65 and 75 degrees of knee flexion. One half of the subjects in each group was tested at each angle in ascending order, while the other half was tested in descending order. The two orders of testing were randomly assigned and balanced over subjects with a matching procedure. Repeated-measures ANOVA with one between groups factor was used to determine if significant differences existed between the groups. Tukey's Honestly Significantly Different test was used to make pairwise comparisons between group means at each angle. Upon statistical analysis it was determined that no significant differences existed between the groups at each angle of measurement except at 75 degrees of knee flexion (p
Author: Timothy Lew Eason
Publisher:
ISBN:
Category : Isometric exercise
Languages : en
Pages : 92
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Author: Richard R. Danielson
Publisher:
ISBN:
Category : Leg
Languages : en
Pages : 0
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A study was undertaken in order to compare the relative efficacy of concentric, eccentric and isometric training on strength of leg extensor muscles. Subproblems investigated were the rate of training for each of the 3 groups, the establishment of concentric, eccentric and isometric strengths of leg extensors and the formulation of equations for predicting any one strength from one of the other two. Three groups of 10 University of Alberta freshmen participated in and completed a training and testing program over a period of 9 weeks, 7 weeks serving as training sessions. Four tests were given throughout the course of the experiment; concentric, eccentric and isometric strength being measured during each test. During the first 3 train ing sessions, all subjects executed 6 contractions of the type assigned to their respective groups and by the eighteenth training session, they executed 18 training con tractions per session. Training occurred on an average of 3 times weekly for all subjects; usually Monday, Wednesday and Friday. Subject data was subjected to analyses of variance and the leg strength data was subjected to 3 analyses of variance; one for concentric strength over the 4 test periods, one for eccentric strength and one for isometric strength. The analyses for concentric and eccentric strength were conducted on average force (lbs.) of 2 contractions at knee angles of 80 to 140 degrees inclusive. The analysis for isometric strength was conducted on average force at knee angles of 70, 110 and 150 degrees respectively. Each analysis was of a split-plot design with 2 factors between and 2 factors within subjects. Sheffe's test for multiple comparisons was applied to all significant interaction mean squares. Results indicated that the 3 training groups did not differ significantly in mean age, height, initial weight, final weight, upper leg length, lower leg length, initial leg girth or final leg girth. Subjects increased signifi cantly in weight. Both the concentric and eccentric training groups increased significantly in leg girth (cm.) over the course of the experiment, while the isometric group did not increase significantly. Both concentric and isometric strength could be described more advantageously by a quadratic than by a linear equation linking average force with knee angle. Eccentric strength could be described equally well by either a linear or quadratic equation. Average eccentric strength over angles of 60 to 150 degrees inclusive was found to be 87.07% greater than average concentric strength over the same 10 angles. Average isometric strength over the angles of 70, 110 and 150 degrees was found to be 92.09% greater than average concentric strength and 0.16% less than average eccentric strength over the same 3 angles. Eccentric and concentric strength at angles 80 to 140 degrees inclusive, as well as eccentric and isometric strength at a knee angle of 110 degrees were found to be essentially unrelated as indicated by their small amount of common variance (less than 20%). Concentric and isometric strength at 110 degrees were better related (45.14% common variance) indicating that prediction from one to the other at that angle would be possible. Results of the concentric analysis showed that the eccentric and isometric training groups both increased sig nificantly at the .05 level in mean concentric strength. The concentric training group showed a decrease in performance from test 3 to test 4 and did not increase significantly over the experiment. The isometric training group was found to produce the optimum rate of mean strength increase over the first 5 weeks of training after which the eccentric training group proved to be as effective as that group. All groups increased significantly in mean eccentric strength over the 7 weeks of training. Although the mean strength for the concentric training group was found to be significantly greater than the mean for the other 2 over the first 3 tests, it was seen by inspection that the linear slopes of the concentric and isometric training groups were similar and greater indicating that these 2 methods of training provided faster rates of eccentric strength increase than did isometric training. The concentric and isometric training groups increased significantly in mean isometric strength over the 4 test periods. The eccentric group did not increase significantly in mean isometric strength, but did not differ significantly from the other 2 training groups with respect to rate of strength increase. It was concluded that all 3 training methods are equally effective in increasing isometric strength. In all 3 methods of measuring strength, it was seen that the greater knee angles showed training effects more than the lesser knee angles. The general conclusion of the study was that isometric training proved to be the most advantageous in improving strength measured concentrically, eccentrically and isometrically. Specificity of training effects were not seen in the present study.
Author: Jerrold Scott Petrofsky
Publisher: Charles C. Thomas Publisher
ISBN:
Category : Health & Fitness
Languages : en
Pages : 178
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Author: Glenn Curtis Smith
Publisher:
ISBN:
Category :
Languages : en
Pages : 136
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Author: Richard L. Lieber
Publisher: LWW
ISBN:
Category : Health & Fitness
Languages : en
Pages : 328
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Book Description
In its Third Edition, this text addresses basic and applied physiological properties of skeletal muscle in the context of the physiological effects from clinical treatment. Anyone interested in human movement analysis and the understanding of generation and control from the musculoskeletal and neuromuscular systems in implementing movement will find this a valuable resource. A highlight color has been added to this edition's updated figures and tables, and the color plates section has been doubled, ensuring that all figures that need color treatment to clarify concepts receive this treatment. A new Clinical Problem feature uses concepts presented in each chapter in the context of a specific clinical case--for example, a spinal cord injury, a sports accident, or rehabilitation after bed rest.
Author: H. John Yack
Publisher:
ISBN:
Category :
Languages : en
Pages : 132
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Author: John R. Richardson
Publisher:
ISBN:
Category : Isometric exercise
Languages : en
Pages : 0
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The purpose of the study was to investigate the effects of short bouts of maximal isotonic and isometric contractions on the development of strength and muscular endurance of the extensors of the knee. Subproblems investigated were crosstransfer, hypertrophy, and specificity of training. Sixty grade ten boys enrolled in a required physical education class at Bonnie Doon high school in the city of Edmonton served as subjects. After initially being measured for girth and fat, strength at angles of 115 degrees and 135 degrees of extension, and muscular endurance (holding time), the boys were randomly divided into three groups, each group containing twenty subjects. One group became the isotonic training group; a second group became the isometric training group; the third group became the control. The exercises were performed once daily, five days a week, for five weeks. The isometric exercise programme consisted of three six second maximal contractions. One contraction was made with the leg 90 degrees flexed, one at 135 degrees of extension, and one at 165 degrees of extension. The isotonic exercise programme consisted of lifting a maximal weight from the 90 degree flexed position to the 165 degrees extended position three times daily. Each bout required six seconds for the leg to be moved through the specified range. The leg was extended at a constant rate. Results were considered statistically significant at the .05 level of confidence. It was concluded that the isotonic exercise group increased significantly over the isometric group (F=6.26[subscript .05]), and both exercise groups increased significantly over the control group (F=26.95[subscript .01]), at the 135 degree angle, when measured for strength. Both exercise groups made a significant increase in strength over the control group (F=l8.91[subscript .01]) at the 115 degree angle. The muscular endurance, when measured by employing the same weight for both initial and final tests, increased significantly for the combined isotonic and isometric group scores of the trained leg (F=4.51[subscript .01]) when compared to the control. Cross-transfer of strength was statistically significant for both isotonic and isometric exercise groups at both the 115 degrees (.01 level) and 135 degrees (.01 level) angles. There was no evidence of cross-transfer of muscular endurance. No evidence was found to support either hypertrophy or specificity training.
